/*
 * Copyright 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.motion.demo.stagger

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.example.android.motion.model.Cheese
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch

class CheeseListViewModel : ViewModel() {

    private val _cheeses = MutableLiveData<List<Cheese>>()
    val cheeses: LiveData<List<Cheese>> = _cheeses

    init {
        refresh()
    }

    fun empty() {
        _cheeses.value = emptyList()
    }

    fun refresh() {
        viewModelScope.launch {
            // Simulate a loading delay of database, filesystem, etc.
            delay(300L)
            _cheeses.value = Cheese.ALL
        }
    }
}
